ST62T09CM6 STMicroelectronics, ST62T09CM6 Datasheet - Page 19

• Manufacturer Part Number: ST62T09CM6
• Description: Microcontrollers (MCU) OTP EPROM 1K No Intf
• Manufacturer: STMicroelectronics

Specifications of ST62T09CM6

• Processor Series: ST62T0x
• Core: ST6
• Data Bus Width: 8 bit
• Program Memory Type: EPROM
• Program Memory Size: 1 KB
• Data Ram Size: 64 B
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Operating Supply Voltage: 3 V to 6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-20
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / Rohs Status: Details

5 CLOCKS, SUPPLY AND RESET
5.1 CLOCK SYSTEM
The main oscillator of the MCU can be driven by
any of these clock sources:
– external clock signal
– external AT-cut parallel-resonant crystal
– external ceramic resonator
– external RC network (R
In addition, an on-chip Low Frequency Auxiliary
Oscillator (LFAO) is available as a back-up clock
system or to reduce power consumption.
An optional Oscillator Safeguard (OSG) filters
spikes from the oscillator lines, and switches to the
LFAO backup oscillator in the event of main oscil-
lator failure. It also automatically limits the internal
clock frequency (f
to guarantee correct operation. These functions
are illustrated in
Figure 9. Clock Circuit Block Diagram
OSCILLATOR
MAIN
Figure
INT
) as a function of V
10, and
f
OSG ENABLE OPTION BIT (See OPTION BYTE SECTION)
OSC
NET
).
Figure
OSCILLATOR SAFEGUARD (OSG)
filtering
LFAO
OSG
DD
11.
, in order
(ADCR REGISTER)
OSCOFF BIT
Table 6
figurations using an external crystal or ceramic
resonator, an external clock input, an external re-
sistor (R
the LFAO.
For more details on configuring the clock options,
refer to the Option Bytes section of this document.
The internal MCU clock frequency (f
by 12 to drive the Timer, the Watchdog timer and
the A/D converter, by 13 to drive the CPU core and
the SPI and by 1 or 3 to drive the ARTIMER, as
shown in
With an 8 MHz oscillator, the fastest CPU cycle is
therefore 1.625µs.
A CPU cycle is the smallest unit of time needed to
execute any operation (for instance, to increment
the Program Counter). An instruction may require
two, four, or five CPU cycles for execution.
* Depending on device. See device summary on page 1.
0
1
ST6208C/ST6209C/ST6210C/ST6220C
NET
illustrates various possible oscillator con-
*
Figure
Oscillator
Divider
), or the lowest cost solution using only
9.
f
INT
: 12
: 13
: 1
: 3
CORE
8-BIT TIMER
WATCHDOG
ADC
SPI
8-BIT ARTIMER
8-BIT ARTIMER
INT
) is divided
*
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